Plotinos: Complete Works, v. 1 In Chronological Order,...

For a long period Plotinos did not write anything. He contented himself with teaching orally what he had learned from Ammonius. He thus passed ten whole years teaching a few pupils, without committing anything to writing. However, as he allowed his pupils to question him, it often happened that his school was disorderly, and that there were useless discussions, as I later heard from Amelius.